Improvement in core-bars for casting pipe



` UNITED STATES PATENT OEEIoE.

JOHN ENRIGHT, or LOUISVILLE, KENTUCKY, AssieNOE To HiMsELE,

WILLIAM WALL, AND THOMAS ENRIGHT, OF SAME PLAGE.

l lHVIPROVEMENT IN cCiRla-BARSA FOR'CASTING PIPE.

Specticationibrniing part of Letters Patent No. 104,397, dated June 14, 1870.

' transverse vertical section.

This invention relates to a core-bar that may be made to collapse after a pipe has been cast around it, in order that the bar may be readily withdrawn from within the pipe, and

that may be expanded again to the required curved plates, which, together, form a complete cylinder. bare prongs projecting inwardly from each of the plates a, and having inclined lower sides. c is a bar placed centrally within the plates a. el are prongs projecting outwardly from four sides of the bar @beneath the prongs b, and having inclined upper and lower sides. e is a collar placed loosely outside the central bar c, near its upper end. f f are equalizers, pivoted one to each side of the collar e. hare links which connect the upper prongs b of the plate a with the ends of the equalizers j', there being one link to each plate a, and two of said plates being by the links 7L connected with each equalizer. i are prongs with inclined upper surfaces, pro- `jecting inwardly from the four plates a beneath the prongs d of the central bar. k is a key by which the collar c and bar c may be connected by passing it through orifices made for the purpose in each.

The eore-bar, formed of the plates c, is eX- panded, when the plates are suspended by hooks l passed under the equalizers, and connected by chains m with a shackle, u, that is attached to the arm ot a craneby letting the central bar c drop in the collar e until the pin o, which passes through the head of the bars c and enters slot r cut in the sides of the shackle n., brings up against the bottom of said slots and arrests the further descent of the bar. This descent brings the inclined sides of the prongs d of the bar against the inclined sides of the prongs t' of the plates, and consequently forces the latter outward. In

this expanded condition the core-bar is placed in the mold after being coated with loam and` the pipe is poured around it. When the time comes for removing the core-bar from the pipe, the key k is withdrawn from the ori-` tice ot the bar, and remains only in the collar e, being held there by a lip on the latter tting into a groove in the outside of the key, and by means of the crane the bar c is raised in the collar c and brings the upper inclined sides of the prongs d against the lower inclined sides ofthe prongs b, by which movement the plates a are drawn inward, andthe core-bar made to collapse, and after collapsing they rise, hanging on the prongs thus.

The immediate means of elevating-the bar c are the bent arms of the lever s, which is pivoted to the outside of the shackle 'c and turned so as to bring its arms under the -pin o. During the elevation of the bar c the hooks l are beneath the equalizers f. When in this elevated position the core-bar is to be expanded again, the lever s is turned so as to withdraw its arms from beneath the pin o, whereupon the bar c drops, as before described. The key 7c is then anew inserted, and the core-bar is once more ready to be placed in the mold. The upper sides of all the prongs are made of inverted V-shape in order to shed particles of molten metal.

The function of the equalizers f is, as their name imports, to equalize the pressure of the prongs of vthe bar upon the prongs of the plates a.

Instead of the links h, the equalizers f may be extended downward far enough to connect directly with the upper prongs, b, slots being made in the latter to admit of the necessary play of the plates a.

Instead of shackle n, I may prefer to make use of hooks attached to the gibs of the crane and placed under the equal izers when the corebar is elevated. I consider the shackle, however, to be the better arrangement.

In addition to the prongs d on the central bar, two of which on each side are sufficient7 I add prongs t, having recesses in their lower sides, the use of which is t0 support the plates ct against external pressure.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. The prongs d of the cent-ral bar c, in cointhe object specified.

JOHN ENRIGHT. Witnesses SoLoN C. KEMON, D. OURAND. 

